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Powerpoint Template A Taste of Change Exploring the potential of a brackish food forest in Houtrak, North Holland, The Netherlands An Academic Consultancy Training (ACT) project commissioned by Kees van der Vaart, for Staatsbosbeheer | ii Contact information Commissioner: Staatsbosbeheer (Kees van der Vaart) T: +31 6 39482101 E: [email protected] Consultant: ACT-team 2444 Secretary: Noah De Croock T: +31 6 57300066 E: [email protected] Disclaimer This report (product) is produced by students of Wageningen University as part of their MSc-programme. It is not an official publication of Wageningen University or WageningenUR and the content herein does not represent any formal position or representation by Wageningen University. THIS REPORT IS A PRODUCT OF THE ACADEMIC CONSULTANCY TRAINING This report was prepared under the supervision of Lian Kasper and Jeroen Kruit, and was commissioned by Kees van der Vaart for Staatsbobeheer. Cover illustration made by Heleen de Jonge Copyright © May 2020 All rights reserved. No part of this publication may be reproduced or distributed in any form of by any means, without the prior consent of the authors. | iii Preface Salinization of agricultural soils is arguably an unavoidable consequence of climate change with a large impact on global food production. This raises the question of whether to continue fighting saline agricultural soils as is the contemporary norm, or to develop systems that utilize saline soils in a sustainable manner. Staatsbosbeheer (The State Forest Department) as an organization concerned with sustainability, therefore, commissioned this project as part of a series of projects dedicated to alternative forest management practices. Particularly, this project explores the potential for developing a brackish food forest in Houtrak as a creative means of utilizing saline agricultural soils. This report titled “a taste of change” contains responses to the needs of the commissioner in the form of advice on how this idea can be achieved. It combines academic rigour with consultancy advice by providing knowledge on the two important components of the project: the potential plants that can be included in the food forest and the necessary physical conditions that are needed to support them. The project is a novel concept that combines permaculture with principles from several alternative agricultural systems and follows the principles of building with nature. Through this report, we hope to support the commissioner’s ultimate aim of raising public awareness about the need for and the potential of saline soils for growing food in a nature-inclusive manner. This report is, therefore, intended as a baseline document for initiating the brackish food forest in Houtrak. The project team gratefully acknowledges the efforts of the commissioner Kees van der Vaart for his availability and willingness to share knowledge and other information as was required for this project. Furthermore, the team is appreciative of the guidance of the Coach Lian Kasper and her contribution towards our personal and team development. In the same vein, the team appreciates the academic coach Jeroen Kruit for taking time to read through our several manuscripts. Lastly, we would like to thank Wouter van Eck for sharing his insight and hopes for a brackish food forest. We hope that you enjoy reading it! | iv Executive Summary The existential problem of salinization of agricultural soils due to rising sea levels raises the need to search for alternative ways to produce food on brackish soils. To raise awareness for this challenge and explore the potential for nature integrated food production under saline conditions, Staatsbosbeheer wants to develop a brackish food forest in the Houtrak. This project seeks to research the feasibility and options for this plan. The team’s expertise in hydrology and water management, forest and nature conservation, plant adaptation, aquaculture, marine resources and ecology, and food forest design covers the core areas assessing the potential of a brackish food forest. In this report, we have provided hydrological management options based on the insights of a combined water- and salt balance and the abiotic conditions they facilitate, as well as a database containing suitable plant species and their traits. Importantly, the plant species were selected using a Multi-Criteria Analysis (MCA) that classifies the plants into four different categories that consider habitat, water table, texture, moisture, salinity and soil types. A total of 185 plant species (identified based on their salinity tolerance) were subjected to this analysis of which 93% are perennial and have at least one edible plant part. Following the results of the MCA, some high-performing species with high market potential include sea buckthorn, common fig, artichoke, asparagus, among several others. In terms of design options, our proposed design includes geomorphological features like a buffer lake to retain brackish water and a network of creeks to distribute saline water throughout the project area. This report concludes by suggesting a food forest design that includes a variety of landscapes that can support a large range of plant species with different ranges of salinity. | v Contents Preface .......................................................................................................................................................... iii Executive Summary ....................................................................................................................................... iv 1. Introduction ........................................................................................................................................... 1 Salinization of Agricultural soils: to fight or live with it? .......................................................................... 1 Why food forests? ...................................................................................................................................... 1 Problem Statement ................................................................................................................................... 2 Methods and Output .................................................................................................................................. 2 Scope and limitation of the project ........................................................................................................... 4 Research Question ..................................................................................................................................... 5 2. Considerations for the Houtrak Brackish food forest: Abiotic Factors ..................................................... 6 Large-scale abiotic factors ........................................................................................................................ 6 Pre-existing abiotic conditions in the project area .................................................................................... 8 3. Considerations for the Houtrak Brackish food forest: Hydrology and Salinity........................................ 11 Basic theory of groundwater ................................................................................................................... 11 Calculation of highest groundwater level................................................................................................ 11 Water and salt balance ........................................................................................................................... 14 Insights from the water balance ............................................................................................................. 16 Insight from the salt balance .................................................................................................................. 17 Water management design ..................................................................................................................... 19 4. Brackish Food Forest Vegetation .......................................................................................................... 22 Traits and suitable species for a brackish food forest.............................................................................. 22 Suitability: categorizing potential plant species into (four) different abiotic zones ................................ 23 Differences and similarities between zones ............................................................................................. 24 Market Potential ..................................................................................................................................... 26 Availability of planting material ............................................................................................................. 27 Considerations for Invasiveness .............................................................................................................. 27 Differentiation and similarities between brackish and freshwater food forests ...................................... 28 Feedback of vegetation on biotic and abiotic factors .............................................................................. 28 5. Implications for Design and Advice to the Commissioner ..................................................................... 31 | vi Proposed Design .....................................................................................................................................
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